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In recent years we perceive many researches on new techniques for improving the performance of fault-tolerant control systems. Prediction of correct system output is one of these techniques which can calculate and predict the probable correct system output when the ordinary techniques are incapacitated to make decision. In this paper, a performance model of predictive m-out-of-n hybrid redundancy...
The management and automation of business processes have become an essential tasks within IT organizations. Companies could deploy business process management systems to automatize their business processes. BPMS needs to ensure that those are as dependable as possible. Fault tolerance techniques provide mechanisms to decrease the risk of possible faults in systems. In this paper, a framework for developing...
Voting algorithms are used in a wide area of control systems from real-time and safety-critical control systems to pattern recognition, image processing and human organization systems in order to arbitrating among redundant results of processing in redundant hardware modules or software versions. From a point of view, voting algorithms can be categorized to agreement-based voters like plurality and...
In modern safety-critical real-time embedded systems, performance and reliability are two most important parameters. The joint consideration of these two parameters is called performability. This paper evaluates and compares different schedulability conditions, which are used for scheduling tasks with fault-tolerant Rate-Monotonic (RM) algorithm, with respect to their performability. The task re-execution...
The reliability of any wireless communication network is considered as one of the key issue in designing network topology. Geographical locations of nodes play a crucial role in the cost of the network. The topological design of any communication network needs to realize a specified performance at minimal cost. This paper focuses on various approaches of numbering nodes in a topology design and analyses...
In fact the mission for a danger control system consists of several phases. The system configuration, operational requirements for individual components, success criteria and stress on the components, can change from phase to phase. Furthermore, the duration of any phase can use deterministic or random models. All these changes and possibilities affect the system reliability. Thus, in this paper,...
Conventional reliability analysis rely on the probability model, which is often inappropriate for handling complex systems due to the lack of sufficient probabilistic information. For large complex systems made up of many components, the uncertainty of each individual parameter amplifies the uncertainty of the total system reliability. To overcome this problem, the concept of fuzzy approach has been...
High performance and reliability are essential for microprocessor design. As semiconductor processing technology continues to move toward smaller and denser transistors, lower threshold voltages and tighter noise margins, microprocessors are becoming more susceptible to transient faults (soft errors) that can affect reliability. The increasing chip soft error rates make it is necessary to estimate...
The increasingly large demand for data storage has spurred on the development of systems that rely on the aggregate performance of multiple hard drives. In many of these applications, reliability and availability are of utmost importance. It is therefore necessary to closely scrutinize a complex storage system's reliability characteristics. In this paper, we use Markov models to rigorously demonstrate...
A novel control method is presented for improving the reliability of transformerless cascade STATCOMs operating under various faults. A modified H bridge circuit is proposed, and it could be totally bypassed under various faults while the STATCOM keep working. During the fault transient, by controlling the phase of a STATCOMpsilas output voltage, the DC capacitors could be charged or discharged to...
This work proposes a new fault-tolerant method able to deal with open and shortcut circuit faults in SRAM-based FPGA routing connections. The bitflips provoked by upsets in the routing control memory cells are the major concern in SRAM-based FPGAs, since these memory cells represent the majority of the bits in the configuration bitstream. Even in an application hardened by triple modular redundancy...
This paper analyzes the problem of transient-error recovery of several protecting techniques used in fault-tolerant cache memories. In this paper, reliability and mean-time-to-failure (MTTF) equations for several protecting techniques are derived and estimated. The results of the considered techniques are compared with those of cache memories without redundancies and with only parity codes in both...
A number of modulators have been developed that use series connections of high voltage FET modules to provide pulses of up to 55 kV at 250 A. During preproduction testing a number of FET modules failed, which we established was due to load arcs. This was not expected since the arc testing programme conducted during the development had been completely successful. The major problem was traced to the...
Aiming at raising the reliability of the system and making better use of system resources, this paper studies the performance of a fault tolerant multiprocessor system. The fault tolerance strategy used by the system involves how to reallocate tasks that are blocked by breakdown processors and at the same time avoid tasks missing their deadlines. The effects of various parameters on system performance...
The switching elements that are used in switching networks generally cannot tolerate faults. In this paper we propose a fault-tolerant 2*2 switching element called FTSE. An FTSE consists of an interconnection of four ordinary 2*2 switching elements which are controlled by the same control (tag) bit. In the presence of a faulty switching element, the FTSE automatically reconfigures itself and performs...
This paper deals with digital data communication between electric drives and superimposed control levels. These applications require real-time capabilities, high performance and extreme reliability, which can only be guaranteed by fault tolerance and good diagnostics. Existing real-time communication systems lack fault tolerance. A description of a serial real-time communication system, which in contrast...
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